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Full text of "Preliminary tests of some esters of propionic acid"

August 1953 £-862 

United States Department of Agriculture 
Agricultural Research Administration 
Bureau of Entomology and Plant Quarantine 



PRELIMINARY TESTS OF SOME ESTERS OF PROPIONIC ACID 

By G. T. Bottger, A. P. Yerington, and S. I. Gertler, 
Division of Insecticide Investigations 

Seventy-one esters of propionic acid were tested as insecticides in 
the laboratory of this Bureau, at Anaheim, Calif., from March to December 
1951. These esters are represented by the general formula, 


n 

C^-C-OR 

where R is an aryl or alkyl group with or without substituents. All the 
compounds were prepared by reacting alcohols and phenols with propionic 
acid or propionic anhydride under suitable conditions. They were tested 
against three or four species of insects and one spider mite. 

The following species were used: 

Armyworm ( Psuedaletia unipuncta (Haw,)) 

Celery leaf tier ( Phlyctaenia rubigalis (Guen.)) 

Large milkweed bug ( Oncopeltus fasciatus (Dall.)) 

Pea aphid ( Macrosiphum pisi (Harris); 

Salt-marsh caterpillar ( Estigmene acrea (Drury)) 

Two- spotted spider mite ( Tetranychus bimaculatus Harvey) 

The insects were reared in the laboratory, and the two-spotted spider 
mites were collected in the field. 

In each test that the species was used, the following number of indi- 
viduals were tested: 30 larvae of the armyworm and the salt-marsh cater- 
pillar, 24 larvae of the celery leaf tier, 20 milkweed bugs, and an average 
of 29 aphids and 57 mites. The test samples were either sprayed or dusted 
on foliage, and the foliage was placed in petri dishes with larvae of the 
armyworm, the celery leaf tier, and the salt-marsh caterpillar. Large milk- 
weed bugs were placed in 8-cm. crystallizing dishes and dusted or sprayed. 
Untreated food and water were supplied and the dishes were covered with 
coarse muslin. The pea aphids were removed from an infested plant for 
treating, and were kept during the test period on potted Windsor bean plants 
in cloth-capped glass battery jars 7 inches in diameter. The two-spotted 
spider mites were dusted or sprayed while on castor bean leaves and were 
kept in battery jars. 



condi -1 se te: ed 

-olcne basis in acetone or water. 

.e matf nsect eo of 75 perce. 

sprays were leaves 

ine whether th» age 

se against leaf-et . The s. 

.gredient and were ha 

•e was run-off. 

Its of tests with three Own value a. _:.st 

, made for comparsti. -*s 

1 and 2. 

compound :»a 

isects w 

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■ to the most e: 
I ' he two-ppot' as 

• arraywc 

as 0.5-pcrcc :mc con- 

more 

Digitized by the Internet Archive 

and £- in OH1Q 

hlorophenyl propionatr.il I ^U I O 
••- aphid. 

ounds caused gree* -.o one 

os cf insects when t' 

were be ef - -ra and t 

I 

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tted re 

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and m- 

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r was also c ve as a ;■ a con: 

large 

f ft:.y apecies 
*erted as K are give:. sa 

.?- d aa acetone I are 

http://archive.org/details/propicoaOOunit 



- 3 - 

Of 24 effective compounds tested for phototoxicity, 2,4,5-trichlo 

phenyl propionate was the only one that caused modei j severe injury. 

Severe injury resulted to foliage of beans, beets, and corn, and moderate 
injury to cabbage. oj-Bromophenyl propionate caused slight injury to 
radish foliage, and o-bromophenyl propionate caused slight injury to corn 
foliage. 



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